Turbine/SSG has a history of deleting characters for reasons that they think are appropriate.
I can't say whether Firegoddess did any of those things, but that kind of doesn't matter because Turbine/SSG also has a mediocre track record of correctly identifying that behavior. All that matters here is whether SSG *thought* he was doing one of the things that cause them to delete a character.
So an SSG employee deleting his character isn't 100% confirmed as the reason this happened, but it's certainly plausible and it's actually pretty likely given their track record.